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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (Diagnostics) (P0700 To P2097) (H4DOTC) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P1603 Engine Stall History >> Notes

DTC P1603 Engine Stall History: Notes

DTC detecting condition: 

Immediately at fault recognition

CAUTION:
NOTE: This DTC may be detected even if fault does not occur in the vehicle. If the customer does not ask for inspection, clear memory instead of inspection and return the vehicle to the user.

Wiring diagram: 

Engine Electrical System Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM .

Fig 1: Engine Stall History - Wiring Diagram (1 Of 8)
G11270536Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Engine Stall History - Wiring Diagram (2 Of 8)
G09480895Courtesy of SUBARU OF AMERICA, INC.
Fig 3: Engine Stall History - Wiring Diagram (3 Of 8)
G11270520Courtesy of SUBARU OF AMERICA, INC.
Fig 4: Engine Stall History - Wiring Diagram (4 Of 8)
G09480903Courtesy of SUBARU OF AMERICA, INC.
Fig 5: Engine Stall History - Wiring Diagram (5 Of 8)
G11270517Courtesy of SUBARU OF AMERICA, INC.
Fig 6: Engine Stall History - Wiring Diagram (6 Of 8)
G11270516Courtesy of SUBARU OF AMERICA, INC.
Fig 7: Engine Stall History - Wiring Diagram (7 Of 8)
G11270519Courtesy of SUBARU OF AMERICA, INC.
Fig 8: Engine Stall History - Wiring Diagram (8 Of 8)
G11270515Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK DTC. 

    Is any other DTC displayed?

  2. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the value in [Fuel Level Input].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of [Fuel Level Input] 16.4% or more?

    • Yes  : Go to 3. 
    • No  : Fuel may be run out. If the fault occurs after refueling, continue the diagnosis. Go to 3. 
  3. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the value in [Control module voltage].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of [Control module voltage] 11 V or more?

  4. CHECK FOR MALFUNCTION OCCURRENCE. 

    Did you ask the customer about the driving condition and engine speed status when the fault occurred?

    • Yes  :
      • The engine speed dropped slowly and then the engine stalled during idling or deceleration: Go to 5. 
      • The engine speed dropped rapidly and then the engine stalled during idling or deceleration: Go to  83.
      • The engine stalled during standing start, acceleration, or constant speed driving: Go to  89.
    • No  : Ask the customer about the driving condition and engine speed status when fault occurred.
  5. CHECK FREEZE FRAME DATA. 
    1. Using the Subaru Select Monitor, read the values in [Short term fuel trim B1] and [Long term fuel trim B1].
      NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .
    2. Obtain the sum values of [Short term fuel trim B1] and [Long term fuel trim B1] in each freeze frame data.

      Is the sum value of [Short term fuel trim B1] and [Long term fuel trim B1] within ±15% in each freeze frame data?

      • Yes  : Go to  56.
      • No  :
      • More than 15% in each freeze frame data: Go to 6. 
    3. Less than -15% in any one of freeze frame data: Go to  46.
  6. CHECK AIR INTAKE SYSTEM. 

    Check the installing condition of the air intake system.

    Are there holes, loose bolts or disconnection of hose on air intake system?

  7. CHECK PURGE CONTROL SOLENOID VALVE. 

    Check purge control solenoid valve 1 and purge control solenoid valve 2. Ref. to EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES) (H4DOTC)>Purge Control Solenoid Valve>INSPECTION .

    Are the purge control solenoid valve 1 and the purge control solenoid valve 2 normal?

  8. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the value in [Stop Light Switch].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of [Stop Light Switch] OFF in all freeze frame data?

    • Yes  : Go to 11. 
    • No  : Go to 9. 
  9. CHECK CURRENT DATA. 
    1. Start the engine and warm up completely.
    2. Read the value of [Short term fuel trim B1] both when the brake pedal is released and depressed using Subaru Select Monitor.
    NOTE: For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .

    Does the value of [Short term fuel trim B1] with the brake pedal depressed increase by 10% or more compared to when the pedal is released?

  10. CHECK CURRENT DATA. 
    1. Start the engine and warm up completely.
    2. While reproducing the faulty condition of the vehicle, read the values of [Short term fuel trim B1] and [Long term fuel trim B1] using the Subaru Select Monitor.
    3. NOTE: For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .
    4. Obtain the sum values of [Short term fuel trim B1] and [Long term fuel trim B1].

      Is the sum value of [Short term fuel trim B1] and [Long term fuel trim B1] within ±15%?

  11. CHECK IGNITION SYSTEM. 

    Check the ignition system. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Diagnostics for Engine Starting Failure>IGNITION CONTROL SYSTEM .

    Is the ignition system normal?

  12. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the value in [A/F Sensor #1].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of [A/F Sensor #1] 1.00 or more?

    • Yes  : Go to 17. 
    • No  : Go to 13. 
  13. CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR. 

    Check the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Mass Air Flow and Intake Air Temperature Sensor>INSPECTION .

    Is the mass air flow and intake air temperature sensor normal?

  14. CHECK HARNESS BETWEEN ECM AND AIR FLOW & INTAKE AIR TEMPERATURE SENSOR CONNECTOR AND BETWEEN ECM CONNECTOR AND MANIFOLD ABSOLUTE PRESSURE & INTAKE AIR TEMPERATURE SENSOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the manifold absolute pressure and intake air temperature sensor.
    3. Disconnect the connectors from the mass air flow and intake air temperature sensor.
    4. Disconnect the connector from ECM.
    5. Measure the resistance of harness between ECM connector and air flow & intake air temperature sensor connector, and between ECM connector and manifold absolute pressure & intake air temperature sensor.

      Connector & terminal 

      (B134) No. 16 - (B3) No. 3:

      (B134) No. 28 - (B3) No. 2:

      (E159) No. 19 - (E124) No. 4:

      (E158) No. 25 - (E124) No. 1:

      Is the resistance less than 1 Ω?

      • Yes  : Go to 15. 
      • No  : Repair the open circuit in harness between ECM connector and air flow & intake air temperature sensor connector and between ECM connector and manifold absolute pressure & intake air temperature sensor.
  15. CHECK HARNESS BETWEEN ECM AND AIR FLOW & INTAKE AIR TEMPERATURE SENSOR CONNECTOR AND MANIFOLD ABSOLUTE PRESSURE & INTAKE AIR TEMPERATURE SENSOR. 

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (B134) No. 16 - Engine ground:

    (B134) No. 28 - Engine ground:

    (E158) No. 25 - Engine ground:

    (E159) No. 19 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 16. 
    • No  : Repair the short circuit to ground in harness between ECM connector and air flow & intake air temperature sensor connector and between ECM connector and manifold absolute pressure & intake air temperature sensor.
  16. CHECK CURRENT DATA. 
    1. Start the engine and warm up completely.
    2. Using the Subaru Select Monitor, read the value of [Calculated load value], then compare it with the reference value of [Calculated load value] listed in "Data Monitor" in "Subaru Select Monitor" under "Subaru Select Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .
    NOTE:
    • The value of Calculated load value changes depending on how the engine internal parts settle in. If the value is out of standard, judge it by comparing the vehicle with another one with the same specifications and similar conditions such as travel distance.
    • For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .

    Does the value of [Calculated load value] fall between 90 - 110% of the value described in the list?

  17. CHECK FRONT OXYGEN (A/F) SENSOR DATA. 
    1. Start the engine and warm up completely.
    2. Raise the engine speed up to 2, 500 RPM and maintain it for approx. three minutes.
    3. Release the accelerator pedal and idle the engine.
    4. Using [Injection Quantity Control] in [Active Test], read the value of [A/F Sensor #1] at the increase rate of both 12% and -12%.
    NOTE:
    • Perform the operation immediately after the engine comes into idling condition, otherwise the front oxygen (A/F) sensor will be cooled.
    • For detailed procedures, refer to "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Active Test .

    Does the value of [A/F Sensor #1] change to less than 0.88 at the increase rate of 12%, and to 1.12 or more at the rate of -12%?

    • Yes  : Go to 21. 
    • No  : Go to 18. 
  18. CHECK POWER SUPPLY TO FRONT OXYGEN (A/F) SENSOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from front oxygen (A/F) sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between front oxygen (A/F) sensor connector and engine ground.

      Connector & terminal 

      (E24) No. 3 (+) - Engine ground (-):

      Is the voltage 10 V or more?

      • Yes  : Go to 19. 
      • No  : Repair the power supply line.
      NOTE: In this case, repair the following item:
      • Open circuit in harness between A/F, oxygen sensor relay and front oxygen (A/F) sensor connector
      • Poor contact of A/F, oxygen sensor relay connector
      • Poor contact of coupling connector
      • Malfunction of A/F, oxygen sensor relay
  19. CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and front oxygen (A/F) sensor connector.

      Connector & terminal 

      (E158) No. 15 - (E24) No. 1:

      (E158) No. 27 - (E24) No. 4:

      (E158) No. 39 - (E24) No. 5:

      (E159) No. 9 - (E24) No. 2:

      Is the resistance less than 1 Ω?

      • Yes  : Go to 20. 
      • No  : Repair the open circuit of harness between ECM connector and front oxygen (A/F) sensor connector.
  20. CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. 

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (E158) No. 15 - Engine ground:

    (E158) No. 27 - Engine ground:

    (E158) No. 39 - Engine ground:

    (E159) No. 9 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 21. 
    • No  : Repair the short circuit to ground in harness between ECM connector and front oxygen (A/F) sensor connector.
  21. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the values in [Coolant Temp.] and [Ambient air temperature].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of [Coolant Temp.] 120°C (24°F) or more? Or is the value of [Coolant Temp.] 15°C (27°F) or more lower than that of [Ambient air temperature]?

    • Yes  : Go to 22. 
    • No  : Go to 25. 
  22. CHECK ENGINE COOLANT TEMPERATURE SENSOR. 

    Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Engine Coolant Temperature Sensor>INSPECTION .

    Is the engine coolant temperature sensor normal?

  23. CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from the engine coolant temperature sensor.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM connector and engine coolant temperature sensor connector.

      Connector & terminal 

      (E159) No. 27 - (E8) No. 1:

      (E158) No. 38 - (E8) No. 2:

      Is the resistance less than 1 Ω?

      • Yes  : Go to 24. 
      • No  : Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector.
  24. CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. 

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (E158) No. 38 - Engine ground:

    (E159) No. 27 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 25. 
    • No  : Repair the short circuit to ground in harness between ECM connector and engine coolant temperature sensor connector.
  25. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the value in [EVAP Purge Flow].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of [EVAP Purge Flow] 0% in all freeze frame data?

    • Yes  : Go to 35. 
    • No  : Go to 26. 
  26. CHECK PURGE CONTROL SOLENOID VALVE 1. 
    1. On the [Active Test] item, select [CPC Solenoid 2] and switch over between ON/OFF.
      NOTE: For detailed procedures, refer to "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Active Test .
    2. Check if the ventilation changes according to ON/OFF switching operation.

      Does the ventilation of purge control solenoid valve 1 change correctly?

      • Yes  : Go to 30. 
      • No  : Go to 27. 
  27. CHECK POWER SUPPLY TO PURGE CONTROL SOLENOID VALVE 1 CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from purge control solenoid valve 1.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between purge control solenoid valve 1 connector and engine ground.

      Connector & terminal 

      (E4) No. 1 (+) - Engine ground (-):

      Is the voltage 10 V or more?

      • Yes  : Go to 28. 
      • No  : Repair the power supply circuit.
  28. CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE 1 CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and purge control solenoid valve 1 connector.

      (E159) No. 4 - (E4) No. 2:

      Is the resistance less than 1 Ω?

      • Yes  : Go to 29. 
      • No  : Repair the open circuit in harness between ECM connector and purge control solenoid valve 1 connector.

      Connector & terminal 

  29. CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE 1 CONNECTOR. 

    Measure the resistance between the purge control solenoid valve 1 connector and engine ground.

    Connector & terminal 

    (E4) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 30. 
    • No  : Repair the ground short circuit of harness between ECM connector and purge control solenoid valve 1 connector.
  30. CHECK PURGE CONTROL SOLENOID VALVE 2. 
    1. Connect all connectors.
    2. On the [Active Test] item, select [CPC Solenoid 2] and switch over between ON/OFF.
      NOTE: For detailed procedures, refer to "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Active Test .
    3. Check if the ventilation changes according to ON/OFF switching operation.

      Does the ventilation of purge control solenoid valve 2 change correctly?

      • Yes  : Go to 35. 
      • No  : Go to 31. 
  31. CHECK POWER SUPPLY TO PURGE CONTROL SOLENOID VALVE 2 CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from purge control solenoid valve 2.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between purge control solenoid valve 2 connector and engine ground.

      Connector & terminal 

      (E52) No. 1 (+) - Engine ground (-):

      Is the voltage 10 V or more?

      • Yes  : Go to 32. 
      • No  : Repair the power supply circuit.
  32. CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE 2 CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and purge control solenoid valve 2 connector.

      Connector & terminal 

      (E159) No. 12 - (E52) No. 2:

      Is the resistance less than 1 Ω?

      • Yes  : Go to 33. 
      • No  : Repair the open circuit in harness between ECM connector and purge control solenoid valve 2 connector.
  33. CHECK HARNESS BETWEEN ECM AND PURGE CONTROL SOLENOID VALVE 2 CONNECTOR. 

    Measure the resistance between the purge control solenoid valve 2 connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (E52) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 34. 
    • No  : Repair the ground short circuit of harness between ECM connector and purge control solenoid valve 2 connector.
  34. CHECK FOR POOR CONTACT. 

    Check for poor contact of ECM connector.

    Is there poor contact of ECM connector?

  35. CHECK OF FUEL PUMP. 
    1. On the [Active Test] item, select [Fuel Pump Relay] and switch over between ON/OFF.
      NOTE: For detailed procedures, refer to "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Active Test .
    2. Check if operating sound occurs in the fuel pump according to ON/OFF switching operation.

      Does the fuel pump emit operating sound?

      • Yes  : Go to 37. 
      • No  : Go to 36. 
  36. CHECK OF FUEL PUMP. 

    Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Fuel Pump>INSPECTION .

    Is the fuel pump normal?

  37. CHECK FUEL TANK. 

    Check if any foreign matters such as iron powder exist in the fuel tank.

    Is there any foreign matter in the fuel tank?

    • Yes  : Remove foreign matter from the fuel tank.
    • No  : Go to 38. 
  38. CHECK FUEL PRESSURE. 
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION: Be careful not to spill fuel.

    Measure the fuel pressure. Ref. to MECHANICAL(H4DOTC)>Fuel Pressure>INSPECTION .

    CAUTION: Release fuel pressure before removing the fuel pressure gauge.

    Is the measured value 340 - 400 kPa (3.5 - 4.1 kgf/cm2 , 49 - 58 psi)?

  39. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the values in [Fuel Rail Pressure A] and [Commanded Fuel Rail Pressure A].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value in [Fuel Rail Pressure A] synchronized with the one in [Commanded Fuel Rail Pressure A] in all freeze frame data?

  40. CHECK IGNITION SYSTEM. 

    Check the ignition system. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Diagnostics for Engine Starting Failure>IGNITION CONTROL SYSTEM .

    Is the ignition system normal?

  41. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the value of Calculated load value, then compare it with the reference value of [Calculated load value] listed in "Data Monitor" under "Subaru Select Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .

    NOTE:
    • The value of Calculated load value changes depending on how the engine internal parts settle in. If the value is out of standard, judge it by comparing the vehicle with another one with the same specifications and similar conditions such as travel distance.
    • For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of Calculated load value 110% or more of the value described in the list?

    • Yes  : Go to 43. 
    • No  : Go to 42. 
  42. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the value in [A/F Sensor #1].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value in [A/F Sensor #1] less than 1.00?

    • Yes  : Go to 47. 
    • No  : Go to 52. 
  43. CHECK AIR FLOW & INTAKE AIR TEMPERATURE SENSOR AND MANIFOLD ABSOLUTE PRESSURE & INTAKE AIR TEMPERATURE SENSOR. 

    Check air flow & intake air temperature sensor and manifold absolute pressure & intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Mass Air Flow and Intake Air Temperature Sensor>INSPECTION . Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Manifold Absolute Pressure and Intake Air Temperature Sensor>INSPECTION .

    Are air flow & intake air temperature sensor and manifold absolute pressure & intake air temperature sensor normal?

  44. CHECK HARNESS BETWEEN ECM AND AIR FLOW & INTAKE AIR TEMPERATURE SENSOR AND MANIFOLD ABSOLUTE PRESSURE & INTAKE AIR TEMPERATURE SENSOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the manifold absolute pressure and intake air temperature sensor.
    3. Disconnect the connectors from the mass air flow and intake air temperature sensor.
    4. Disconnect the connector from ECM.
    5. Measure the resistance of harness between ECM connector and air flow & intake air temperature sensor connector, and between ECM connector and manifold absolute pressure & intake air temperature sensor.

      Connector & terminal 

      (B134) No. 16 - (B3) No. 3:

      (B134) No. 28 - (B3) No. 2:

      (E159) No. 19 - (E124) No. 4:

      (E158) No. 25 - (E124) No. 1:

      Is the resistance less than 1 Ω?

      • Yes  : Go to 45. 
      • No  : Repair the open circuit in harness between ECM connector and air flow & intake air temperature sensor connector and between ECM connector and manifold absolute pressure & intake air temperature sensor.
  45. CHECK HARNESS BETWEEN ECM AND AIR FLOW & INTAKE AIR TEMPERATURE SENSOR AND MANIFOLD ABSOLUTE PRESSURE & INTAKE AIR TEMPERATURE SENSOR CONNECTOR. 

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (B134) No. 16 - Engine ground:

    (B134) No. 28 - Engine ground:

    (E158) No. 25 - Engine ground:

    (E159) No. 19 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 46. 
    • No  : Repair the short circuit to ground in harness between ECM connector and air flow & intake air temperature sensor connector and between ECM connector and manifold absolute pressure & intake air temperature sensor.
  46. CHECK CURRENT DATA. 
    1. Start the engine and warm up completely.
    2. Using the Subaru Select Monitor, read the value of [Calculated load value], then compare it with the reference value of [Calculated load value] listed in "Data Monitor" under "Subaru Select Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .
    NOTE:
    • The value of Calculated load value changes depending on how the engine internal parts settle in. If the value is out of standard, judge it by comparing the vehicle with another one with the same specifications and similar conditions such as travel distance.
    • For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .

    Does the value of [Calculated load value] fall between 90 - 110% of the value described in the list?

  47. CHECK CURRENT DATA. 
    1. Start the engine and warm up completely.
    2. Raise the engine speed up to 2, 500 RPM and maintain it for approx. three minutes.
    3. Release the accelerator pedal and idle the engine.
    4. Using [Injection Quantity Control] in [Active Test], read the value of [A/F Sensor #1] at the increase rate of both 12% and -12%.
    NOTE:
    • Perform the operation immediately after the engine comes into idling condition, otherwise the front oxygen (A/F) sensor will be cooled.
    • For detailed procedures, refer to "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Active Test .

    Does the value of [A/F Sensor #1] change to less than 0.88 at the increase rate of 12%, and to 1.12 or more at the rate of -12%?

    • Yes  : Go to 52. 
    • No  : Go to 48. 
  48. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the value in [A/F Sensor #1 Resistance].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of [A/F Sensor #1 Resistance] 500 Ω or more?

  49. CHECK POWER SUPPLY TO FRONT OXYGEN (A/F) SENSOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from front oxygen (A/F) sensor.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between front oxygen (A/F) sensor connector and engine ground.

      Connector & terminal 

      (E24) No. 3 (+) - Engine ground (-):

      Is the voltage 10 V or more?

      • Yes  : Go to 50. 
      • No  : Repair the power supply line.
      NOTE: In this case, repair the following item:
      • Open circuit in harness between A/F, oxygen sensor relay and front oxygen (A/F) sensor connector
      • Poor contact of A/F, oxygen sensor relay connector
      • Poor contact of coupling connector
      • Malfunction of A/F, oxygen sensor relay
  50. CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and front oxygen (A/F) sensor connector.

      Connector & terminal 

      (E158) No. 15 - (E24) No. 1:

      (E158) No. 27 - (E24) No. 4:

      (E158) No. 39 - (E24) No. 5:

      (E159) No. 9 - (E24) No. 2:

      Is the resistance less than 1 Ω?

      • Yes  : Go to 51. 
      • No  : Repair the open circuit of harness between ECM connector and front oxygen (A/F) sensor connector.
  51. CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. 

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (E158) No. 15 - Engine ground:

    (E158) No. 27 - Engine ground:

    (E158) No. 39 - Engine ground:

    (E159) No. 9 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 52. 
    • No  : Repair the short circuit to ground in harness between ECM connector and front oxygen (A/F) sensor connector.
  52. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the values in [Coolant Temp.] and [Ambient air temperature].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of [Coolant Temp.] 120°C (248°F) or more? Or is the value of [Coolant Temp.] lower than that of [Ambient air temperature] by 15°C (27°F) or more?

  53. CHECK ENGINE COOLANT TEMPERATURE SENSOR. 

    Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Engine Coolant Temperature Sensor>INSPECTION .

    Is the engine coolant temperature sensor normal?

  54. CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from the engine coolant temperature sensor.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM connector and engine coolant temperature sensor connector.

    Connector & terminal 

    (E159) No. 27 - (E8) No. 1:

    (E158) No. 38 - (E8) No. 2:

    Is the resistance less than 1 Ω?

    • Yes  : Go to 55. 
    • No  : Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector.
  55. CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. 

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (E158) No. 38 - Engine ground:

    (E159) No. 27 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Even if DTC is detected, it has returned to a normal condition at this time.

      Reproduce the failure, and then perform the diagnosis.

      NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
    • No  : Repair the short circuit to ground in harness between ECM connector and engine coolant temperature sensor connector.
  56. CHECK IGNITION SYSTEM. 

    Check the ignition system. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Diagnostics for Engine Starting Failure>IGNITION CONTROL SYSTEM .

    Is the ignition system normal?

  57. CHECK FREEZE FRAME DATA. 
    1. Using the Subaru Select Monitor, read the values of the Freeze Frame Data in [Idle Mass Air Flow Feedback correct], [ISC Learning Value] and [Idle dirty throttle correct].
      NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .
    2. Obtain the sum values of [Idle Mass Air Flow Feedback correct], [ISC Learning Value] and [Idle dirty throttle correct].
    3. Start the engine and warm up completely.
    4. Using Subaru Select Monitor, read the values of Idle Mass Air Flow Feedback correct, ISC Learning Value and Idle dirty throttle correct in current data at normal idling.
      NOTE: For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .
    5. Obtain the sum values of [Idle Mass Air Flow Feedback correct], [ISC Learning Value] and [Idle dirty throttle correct].

    Is the sum value of freeze frame data less than 80% of the sum value of current data?

    • Yes  : Go to 58. 
    • No  : Go to 60. 
  58. CHECK AIR INTAKE SYSTEM. 

    Check the installing condition of the air intake system.

    Are there holes, loose bolts or disconnection of hose on air intake system?

  59. CHECK AIR INTAKE SYSTEM. 

    Check the air intake system related parts.

    Are all of the air intake system related parts normal?

    • Yes  : Go to  78.
    • No  : Replace the parts if defective.
  60. CHECK FREEZE FRAME DATA. 
    1. Using the Subaru Select Monitor, read the values in [VVT Adv. Ang. Amount R], [VVT Advance Target Angle Amount R], [VVT Adv. Ang. Amount L], [VVT Advance Target Angle Amount L], [Exh. VVT Retard Ang. R], [Ex VVT Retard Target Angle R], [Exh. VVT Retard Ang. L] and [Ex VVT Retard Target Angle L].
      NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .
    2. Using the Subaru Select Monitor, compare the respective values between the followings: [VVT Adv. Ang. Amount R] and [VVT Advance Target Angle Amount R], [VVT Adv. Ang. Amount L] and [VVT Advance Target Angle Amount L], [Exh. VVT Retard Ang. R] and [Ex VVT Retard Target Angle R], [Exh. VVT Retard Ang. L] and [Ex VVT Retard Target Angle L].

    Does all of the advance angle amount and retard angle amount synchronize with their target values?

    • Yes  : Go to  78.
    • No  : Diagnose the part that does not synchronize.
    • Intake RH: Go to 61. 
    • Intake LH: Go to  65.
    • Exhaust RH: Go to  69.
    • Exhaust LH: Go to  74.
  61. CHECK POWER SUPPLY TO THE INTAKE OIL CONTROL SOLENOID RH. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the intake oil control solenoid RH.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between intake oil control solenoid RH connector and engine ground.

    Connector & terminal 

    (E38) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    • Yes  : Go to 62. 
    • No  : Repair the power supply circuit.
  62. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID RH CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and intake oil control solenoid RH.

    Connector & terminal 

    (E159) No. 7 - (E38) No. 2:

    Is the resistance less than 1 Ω?

    • Yes  : Go to 63. 
    • No  : Repair the open circuit in harness between ECM connector and intake oil control solenoid RH connector.
  63. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID RH CONNECTOR. 

    Measure the resistance between intake oil control solenoid RH connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (E38) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 64. 
    • No  : Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid RH connector.
  64. CHECK INTAKE OIL CONTROL SOLENOID RH. 

    Check the intake oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Oil Control Solenoid>INSPECTION .

    Is the intake oil control solenoid RH normal?

  65. CHECK POWER SUPPLY TO THE INTAKE OIL CONTROL SOLENOID LH. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the intake oil control solenoid LH.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between intake oil control solenoid LH connector and engine ground.

    Connector & terminal 

    (E37) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    • Yes  : Go to 66. 
    • No  : Repair the power supply circuit.
  66. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID LH CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and intake oil control solenoid LH.

    Connector & terminal 

    (E159) No. 15 - (E37) No. 2:

    Is the resistance less than 1 Ω?

    • Yes  : Go to 67. 
    • No  : Repair the open circuit in harness between ECM connector and intake oil control solenoid LH connector.
  67. CHECK HARNESS BETWEEN ECM AND INTAKE OIL CONTROL SOLENOID LH CONNECTOR. 

    Measure the resistance between intake oil control solenoid LH connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (E37) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 68. 
    • No  : Repair the short circuit to ground in harness between ECM connector and intake oil control solenoid LH connector.
  68. CHECK INTAKE OIL CONTROL SOLENOID LH. 

    Check the intake oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Oil Control Solenoid>INSPECTION .

    Is the intake oil control solenoid LH normal?

  69. CHECK POWER SUPPLY TO THE EXHAUST OIL CONTROL SOLENOID RH. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the exhaust oil control solenoid RH.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between exhaust oil control solenoid RH connector and engine ground.

    Connector & terminal 

    (E63) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    • Yes  : Go to 70. 
    • No  : Repair the power supply circuit.
  70. CHECK HARNESS BETWEEN ECM AND EXHAUST OIL CONTROL SOLENOID RH CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and exhaust oil control solenoid RH.

    Connector & terminal 

    (E159) No. 23 - (E63) No. 2:

    Is the resistance less than 1 Ω?

    • Yes  : Go to 71. 
    • No  : Repair the open circuit in harness between ECM connector and exhaust oil control solenoid RH connector.
  71. CHECK HARNESS BETWEEN ECM AND EXHAUST OIL CONTROL SOLENOID RH CONNECTOR. 

    Measure the resistance between exhaust oil control solenoid RH connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (E63) No. 2 - Engine ground

    Is the resistance 1 MΩ or more?

    • Yes  : Go to  73.
    • No  : Repair the short circuit to ground in harness between ECM connector and exhaust oil control solenoid RH connector.
  72. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the values in [Vehicle Speed Sensor], [Engine Speed] and [AT turbine speed].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is there any freeze frame data indicating that the value of [Vehicle Speed Sensor] is less than 30 km/h (18.6 MPH), and that the difference in values between [Engine Speed] and [AT turbine speed] is less than 100 RPM?

  73. CHECK EXHAUST OIL CONTROL SOLENOID RH. 

    Check the exhaust oil control solenoid RH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Oil Control Solenoid>INSPECTION .

    Is the exhaust oil control solenoid RH normal?

  74. CHECK POWER SUPPLY TO THE EXHAUST OIL CONTROL SOLENOID LH. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from the exhaust oil control solenoid LH.
    3. Turn the ignition switch to ON.
    4. Measure the voltage between exhaust oil control solenoid LH connector and engine ground.

    Connector & terminal 

    (E66) No. 1 (+) - Engine ground (-):

    Is the voltage 10 V or more?

    • Yes  : Go to 75. 
    • No  : Repair the power supply circuit.
  75. CHECK HARNESS BETWEEN ECM AND EXHAUST OIL CONTROL SOLENOID LH CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from ECM.
    3. Measure the resistance of harness between ECM connector and exhaust oil control solenoid LH.

    Connector & terminal 

    (E159) No. 31 - (E66) No. 2:

    Is the resistance less than 1 Ω?

    • Yes  : Go to  76.
    • No  : Repair the open circuit in harness between ECM connector and exhaust oil control solenoid LH connector.
  76. CHECK HARNESS BETWEEN ECM AND EXHAUST OIL CONTROL SOLENOID LH CONNECTOR. 

    Measure the resistance between exhaust oil control solenoid LH connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (E66) No. 2 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 77. 
    • No  : Repair the short circuit to ground in harness between ECM connector and exhaust oil control solenoid LH connector.
  77. CHECK EXHAUST OIL CONTROL SOLENOID LH. 

    Check the exhaust oil control solenoid LH. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Oil Control Solenoid>INSPECTION .

    Is the exhaust oil control solenoid LH normal?

  78. CHECK ENGINE COOLANT TEMPERATURE SENSOR. 

    Check the engine coolant temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Engine Coolant Temperature Sensor>INSPECTION .

    Is the engine coolant temperature sensor normal?

  79. CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from the engine coolant temperature sensor.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM connector and engine coolant temperature sensor connector.

    Connector & terminal 

    (E159) No. 27 - (E8) No. 1:

    (E158) No. 38 - (E8) No. 2:

    Is the resistance less than 1 Ω?

    • Yes  : Go to 80. 
    • No  : Repair the open circuit of the harness between the ECM connector and engine coolant temperature sensor connector.
  80. CHECK HARNESS BETWEEN ECM AND ENGINE COOLANT TEMPERATURE SENSOR CONNECTOR. 

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (E158) No. 38 - Engine ground:

    (E159) No. 27 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 81. 
    • No  : Repair the short circuit to ground in harness between ECM connector and engine coolant temperature sensor connector.
  81. CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR. 

    Check the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Mass Air Flow and Intake Air Temperature Sensor>INSPECTION .

    Is the mass air flow and intake air temperature sensor normal?

  82. CHECK MANIFOLD ABSOLUTE PRESSURE AND INTAKE AIR TEMPERATURE SENSOR. 

    Check the manifold absolute pressure and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Manifold Absolute Pressure and Intake Air Temperature Sensor>INSPECTION .

    Is the manifold absolute pressure and intake air temperature sensor normal?

  83. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from fuel injector.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM connector and fuel injector connector.

    Connector & terminal 

    #1 (E158) No. 12 - (E5) No. 1:

    #1 (E158) No. 11 - (E5) No. 2:

    #2 (E158) No. 24 - (E16) No. 1:

    #2 (E158) No. 23 - (E16) No. 2:

    #3 (E158) No. 36 - (E6) No. 1:

    #3 (E158) No. 35 - (E6) No. 2:

    #4 (E158) No. 48 - (E17) No. 1:

    #4 (E158) No. 47 - (E17) No. 2:

    Is the resistance less than 1 Ω?

    • Yes  : Go to 84. 
    • No  : Repair the open circuit of the harness between the ECM connector and fuel injector connector.
  84. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    #1 (E158) No. 12 - Engine ground:

    #1 (E158) No. 11 - Engine ground:

    #2 (E158) No. 24 - Engine ground:

    #2 (E158) No. 23 - Engine ground:

    #3 (E158) No. 36 - Engine ground:

    #3 (E158) No. 35 - Engine ground:

    #4 (E158) No. 48 - Engine ground:

    #4 (E158) No. 47 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 85. 
    • No  : Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
  85. CHECK IGNITION SYSTEM. 

    Check the ignition system. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Diagnostics for Engine Starting Failure>IGNITION CONTROL SYSTEM .

    Is the ignition system normal?

  86. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the values in [A/C Compressor Signal] and [Idle A/C load correct].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Do both values of [A/C Compressor Signal] and [Idle A/C load correct] increase?

  87. CHECK FREEZE FRAME DATA. 
    1. Using the Subaru Select Monitor, read the value in [Electric Load Feedback Val].
      NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .
    2. Compare the value of [Electric Load Feedback Val] with that of ISC Learning Value, which is described in "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .
    NOTE: For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .

    Is the value of [Electric Load Feedback Val] 20% or more compared to that of ISC Learning Value?

  88. CHECK DTC. 

    Is DTC of CVT displayed? Ref. to TRANSMISSION (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

    • Yes  : Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)".
    • No  : Even if DTC is detected, it has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis.
      NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
  89. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the values in [Calculated load value] and [Relative Throttle Position].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value of [Calculated load value] decreasing while that of [Relative Throttle Position] is increasing?

    • Yes  : Go to 90. 
    • No  : Go to  94.
  90. CHECK MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR. 

    Check the mass air flow and intake air temperature sensor. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Mass Air Flow and Intake Air Temperature Sensor>INSPECTION .

    Is the mass air flow and intake air temperature sensor normal?

  91. CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from the mass air flow and intake air temperature sensor.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM connector and the mass air flow and intake air temperature sensor connector.

    Connector & terminal 

    (B134) No. 16 - (B3) No. 3:

    (B134) No. 28 - (B3) No. 2:

    Is the resistance less than 1 Ω?

    • Yes  : Go to 92. 
    • No  : Repair the open circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
  92. CHECK HARNESS BETWEEN ECM AND MASS AIR FLOW AND INTAKE AIR TEMPERATURE SENSOR CONNECTOR. 

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    (B134) No. 16 - Engine ground:

    (B134) No. 28 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 93. 
    • No  : Repair the ground short circuit of harness between ECM connector and the mass air flow and intake air temperature sensor connector.
  93. CHECK CURRENT DATA. 
    1. Start the engine and warm up completely.
    2. Using the Subaru Select Monitor, read the value of [Calculated load value], then compare it with the reference value of [Calculated load value] listed in "Data Monitor" under "Subaru Select Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .
    NOTE:
    • The value of Calculated load value changes depending on how the engine internal parts settle in. If the value is out of standard, judge it by comparing the vehicle with another one with the same specifications and similar conditions such as travel distance.
    • For detailed procedures, refer to "Data Monitor". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>DATA MONITOR .

    Does the value of [Calculated load value] fall between 90 - 110% of the value described in the list?

  94. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector from fuel injector.
    3. Disconnect the connector from ECM.
    4. Measure the resistance of harness between ECM connector and fuel injector connector.

    Connector & terminal 

    #1 (E158) No. 12 - (E5) No. 1:

    #1 (E158) No. 11 - (E5) No. 2:

    #2 (E158) No. 24 - (E16) No. 1:

    #2 (E158) No. 23 - (E16) No. 2:

    #3 (E158) No. 36 - (E6) No. 1:

    #3 (E158) No. 35 - (E6) No. 2:

    #4 (E158) No. 48 - (E17) No. 1:

    #4 (E158) No. 47 - (E17) No. 2:

    Is the resistance less than 1 Ω?

    • Yes  : Go to 95. 
    • No  : Repair the open circuit of the harness between the ECM connector and fuel injector connector.
  95. CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR. 

    Measure the resistance between the ECM connector and engine ground.

    NOTE: Connect all connectors after measurement.

    Connector & terminal 

    #1 (E158) No. 12 - Engine ground:

    #1 (E158) No. 11 - Engine ground:

    #2 (E158) No. 24 - Engine ground:

    #2 (E158) No. 23 - Engine ground:

    #3 (E158) No. 36 - Engine ground:

    #3 (E158) No. 35 - Engine ground:

    #4 (E158) No. 48 - Engine ground:

    #4 (E158) No. 47 - Engine ground:

    Is the resistance 1 MΩ or more?

    • Yes  : Go to 96. 
    • No  : Repair the short circuit to ground in harness between ECM connector and fuel injector connector.
  96. CHECK IGNITION SYSTEM. 

    Check the ignition system. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Diagnostics for Engine Starting Failure>IGNITION CONTROL SYSTEM .

    Is the ignition system normal?

  97. CHECK OF FUEL PUMP. 
    1. On the [Active Test] item, select [Fuel Pump Control (ON/OFF Dr.)] and switch over between ON/OFF for the fuel pump.
      NOTE: For detailed procedures, refer to "Active Test". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Active Test .
    2. Check if operating sound occurs in the fuel pump according to ON/OFF switching operation.

    Does the fuel pump emit operating sound?

    • Yes  : Go to  99.
    • No  : Go to 98. 
  98. CHECK OF FUEL PUMP. 

    Check fuel pump. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>Fuel Pump>INSPECTION .

    Is the fuel pump normal?

  99. CHECK FUEL TANK. 

    Check if any foreign matters such as iron powder exist in the fuel tank.

    Is there any foreign matter in the fuel tank?

    • Yes  : Remove foreign matter from the fuel tank.
    • No  : Go to 100. 
  100. CHECK FUEL PRESSURE. 
    WARNING: Place "NO OPEN FLAMES" signs near the working area.
    CAUTION: Be careful not to spill fuel.

    Measure the fuel pressure. Ref. to MECHANICAL(H4DOTC)>Fuel Pressure>INSPECTION .

    CAUTION: Release fuel pressure before removing the fuel pressure gauge.

    Is the measured value 340 - 400 kPa (3.5 - 4.1 kgf/cm2 , 49 - 58 psi)?

  101. CHECK FREEZE FRAME DATA. 

    Using the Subaru Select Monitor, read the values in [Fuel Rail Pressure A] and [Commanded Fuel Rail Pressure A].

    NOTE: For detailed operation procedures, refer to "Freeze Frame Data". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Subaru Select Monitor>OPERATION>FREEZE FRAME DATA .

    Is the value in [Fuel Rail Pressure A] synchronized with the one in [Commanded Fuel Rail Pressure A] in all freeze frame data?

  102. CHECK ENGINE RUNNING CONDITION. 

Check the engine running condition using the cylinder monitor for the respective cylinders in the Subaru Select Monitor.

NOTE: For detailed operation procedures, refer to "PC application help for Subaru Select Monitor".

Is there a large difference in the speed between each cylinder?

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